Confused between using the plugin and the service

I had previously installed the Unity Ads plugin, integrated the code into my game then added the game to the Unity Ads Dashboard. This gave me 2 Game ID's. BUT I just discovered the services tab in Unity had a button to enable the Ads service so I clicked it and enabled the game for Ads in the editor. This has given me 2 new Game ID's which are different to the ones I had before.

So I went to the dashboard at UnityAds and now my game shows up twice, once at the top of the screen with the 2...

Confused between using the plugin and the service